• Objectives

Understand feedback control.

• What to Bring

Each group should bring a USB storage device to store the screen image.

3 Open Loop ControlPlant

Figure 1: Plant Circuit

Steps:

1. Construct the plant circuit according to Figure 1. Where R₀ = 10k, C₁ = 100F, C₂ = 0.22F.
2. Impulse response: A=1V, width=0.1s, f=1Hz. (1 Picture)
3. Step Response: A=1V, f=1Hz.(1 Picture)

For example, for the step response, you should try to get something like the waveform shown in following figure.

Figure 2: Plant Result

Note 1: Do not destroy your plant circuit after you get the image, you are going to use it in the next part.

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Lab 3 Feedback Control

Note 2: Do not forget to supply all the op-amps with DC voltage(Pin 4(-12V) and 7(12V))

Note 3: If a capacitor is labeled474, its capacitance is 47 10⁴ pF; 224 is 22 10⁴ pF

Figure 3: Op-amp

4 Feedback Control

Figure 4: Feedback Control Circuit

Steps:

1. Add the feedback control circuit to the plant according to Figure 3. Where R₁ = R₃ = 150k, R₂ = 3k, C₃ = 0.47F.
2. Impulse response: A=1V, width=0.1s, f=1Hz. (1 Picture)
3. Step Response: A=1V, f=1Hz.(1 Picture)

For example, for step response, you should try to get something like the waveform shown in the following figure.

Figure 5: Feedback Control Result

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